Machinery-driving belt



July 7, 1925.

A. HENDRY ET AL MACHINERY DRIVING BELT Filed March 9, 1925 Patented July7, 1925.

n am STATES PATENT caries.

MACHINERY-DRIVING BELT.

Application filed March 9, 1923. Serial No. 624,020.

To all whom it may concern:

Be it known that we, ALEXANDER HEN DRY and MALCOLM ALLA-N HnNnRY, bothsubjects of the King of Great Britain and Ireland (whose post-officeaddress is 252 Main Street, Bridgeton, Glasgow, Scotland), have inventednew and useful Im provem'ents in Machinery-Driving Belts, of which thefollowing is 'a specification.

This invention comprises improvements in and relating to belts formachinery driving of the type formed by parallel layers of leather orother suitable material, and commonly known as Hendrys laminatedbelting.

The object of our invention is to so construct such belts that they willhave increased flexibility when driving or traversing over pulleys.

According to our invention in belts of the type set forth the strandsforming the centre portion thereof, or a number of such strands, areformed with grooves extending longitudinally of one or both of theadjacent sides thereof.

In order that our invention will be properly understood and carried intoeffect we have hereunto appended an explanatory sheet of drawingswhereon:

' Figure 1 is a cross section of a belt embodying our presentimprovements and considerably enlarged to illustrate more clearly theconstruction thereof.

Figure 2 is a side elevation of a part of one of the inner strandsforming the improved belt.

Figure 3 designates a section of such strand. Figure 1 is a section oftwo of such strands as used in the construction of the belt shown inFigure 1.

Figure 5 is a section of a single strand grooved on both sides, and

Figure 6 illustrates a side elevation of part of a strand grooved atintervals.

In the belt shown in Figure 1 the inner part thereof is formed of doublestrands each comprising two single strands a and bunited by stitchingall the double strands together with the outer'strands being sewntogether as is the common practice with this type of belting.

The faces a and o of the strands a and b are provided with longitudinalgrooves, which latter form longitudinal channels 0, but it will beunderstood that such grooves .are shown much exaggerated owing to thescale towhich Figure 1 is drawn.

The outer strands d are alsopreferably grooved to protect the stitchingby which all the strands are united. As shown in Figure 1, certain ofthe outer strands d are provided with raised portions adapted to fitinto the grooves of the preceding strands. Instead of theinner portionof the belt being formed of double strands, it may be formed of singlestrands grooved on the opposite sides as shown by Figure 5.

The grooves .made in the inner layers, which grooves are locatedcentrally with respect to theopposite faces of the belt, may be of anyconvenient formation, but preferably of a shallow V or concave shape.

In some'cases where the strands are of an irregular gauge, the groovesmay bs formed intermittently at spaced distances apart as shown atFigure 6, the grooves 7 being made where the strands are thickest. Suchstrands would be arranged with their grooves in staggered relationship.

Belts constructed in such manner give great flexibility.

What we claim is v I 1. A belt for machinery driving com prising aplurality of, contiguous strips of material secured together, anunexposed surface ofa number of the central strips having a groovetherein extending longitudinally of the belt, the contiguous stripshaving a bearing portion on each side thereof, above and below thegrooves.

2. A belt for machinery driving comprising a plurality of strips ofmaterial arranged side by side and secured together, an unexposedsurface of a number of the central strips being provided with a grooveextending longitudinally of the belt, there being a bearing portion onopposite sides of the groove.

3. A belt for machinery driving comprising a plurality of strips ofmaterial arranged side by side and secured together, a number of thestrips forming the centre of the belt comprising two strands securedtogether, the unexposed surface of said strips being groovedlongitudinally of the belt so as to provide bearing portions on oppositesides of the groove.

4. A belt for machinery driving comprising a plurality of strips ofmaterial arranged side by side and secured together,

the exposed side of the outer strips, an unexposed side of a number ofthe strips in proximity thereto and an unexposed sidev of a number ofthe strips forming the centre of the belt all grooved longitudinally ofthe belt, said centre strips having a bearing portion above and belowthe grooves.

5. A belt for machinery driving comprising a plurality of stripspofmaterial arranged side by side and secured together,

an unexposed surface of a number of the,

, terial secured together, the unexposed surfaces of a number of thestrips forming the centre of the belt having a series of spaced andsubstantially aligned grooves therein said extending longitudinally ofthe belt, the grooves of the respective series being arranged instaggered relationship, the strips forming the outer edge of said beltbeing provided With raised portions adapted to seat inthe groovedsurface of adjacent strips, the central contiguous strips having abearing portion on each side thereof, above and below the grooves. V

7 L A belt-for machinery driving comprising a pluralityof strips ofmaterial positioned side by side and secured together, an unexposedsuriace of a number of the central strips being provided with a grooveextending longitudinally of the belt, the contiguous strips havingbearing portions above and below the grooves, t-he contiguous bearingportions being in frictional contact. I

' ALEXANDER HENDRY. MALCOLM A. HENDRY. lVitnesses:

JOHN SIME, CnoIL G. GALL.

